20415147 has 8 divisors (see below), whose sum is σ = 28821456. Its totient is φ = 12809472.

The previous prime is 20415133. The next prime is 20415149. The reversal of 20415147 is 74151402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20415147 - 2¹⁵ = 20382379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20415149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200098 + ... + 200199.

It is an arithmetic number, because the mean of its divisors is an integer number (3602682).

Almost surely, 2^20415147 is an apocalyptic number.

20415147 is a deficient number, since it is larger than the sum of its proper divisors (8406309).

20415147 is a wasteful number, since it uses less digits than its factorization.

20415147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400317.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 20415147 is about 4518.3124061977. The cubic root of 20415147 is about 273.3070516405.

Adding to 20415147 its reverse (74151402), we get a palindrome (94566549).

It can be divided in two parts, 204 and 15147, that added together give a palindrome (15351).

The spelling of 20415147 in words is "twenty million, four hundred fifteen thousand, one hundred forty-seven".